With a pair of BMX shin guards, you can avoid getting your shin ripped to pieces when your foot slips off the pedal or when you slam.
The same goes for ankle guards, which protect you from a stray frame. Some of the BMX shin pads you find in this category have both shin guards and ankle pads in one piece.
A lot of the BMX shin guards and ankle guards you'll find in the category are designed to keep you safe but at the same time allow you to move freely.
Shin pads are probably more in use than you might think since it is very easy to wear them underneath your clothing.